Your bird has a serious illness and there is nothing but supportive care that you can give him at home. We cannot recommend any medications because we do not have anything close to a diagnosis.
When we first started to keep birds as pets, all we knew was to feed them seeds and the lucky ones also got table scraps. Avian medicine has come a long way, and we now know that seeds, as the main course, are deficient in Calcium, Vitamin A, protein and micro-nutrients (to name a few). Therefore, we now feed pellet-based diets, and give seeds as treats.
I suggest you call the UM Vet College (http://www.cvm.umn.edu/ ) for a referral to an avian vet, or try to find someone from this list: www.aav.org/vet-lookup .
I wish you good-luck with your little friend,
Please click on the green ACCEPT so that I might be compensated for my time. Thank-you.
You are paying for the opinions of two professionals, who both made the recommendation that you see a vet. This is an 'information site'; we cannot diagnose problems or medicate without performing an actual exam on a patient.
You are paying for the information about a correct diet, as well as for the information concerning budgie longevity.
I am sorry that we cannot offer you more to help your bird, but I hope you can find someone close to see him. His problem may be easily treatable with the right medication.